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Actually air comes in very handy as the 4'th requirement. AND it needs to be properly mixed with the proper amount of fuel. Given that it flat out died, air and compression are not the issue. Remove one of the plugs. Plug the plug wire into the removed plug. Ground the body of the plug to the engine. (you can use a wire with a alligator clamp around the plug with the other end attached to the engine or other good ground source. Have somebody crank the engine over. Do you see a nice blue spark? If yellow, or missing you have ignition issues.
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I believe that if the CPS is the problem the computer will fire the plugs at the wrong time. So in theory the spark may be good but at the wrong time00 SAN 210 (previous boat)
07 236 te soldComment
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I also thought it would be simple as unplugging, but in reference to the illustration on the manual which only showed one side of the engine and did not clearly indicate location of the sensor (#5) it was difficult to find. I have a feeling the exhaust manifold will have to be removed in order to access the sensor. could be done but laborious. also have to consider replacing seals, gaskets..Originally posted by NautiDave07 View PostComment
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rechecking the spark plugs was redone yesterday with alligator clips grounded to the engine ground. confirmed no spark. also retested lanyard.Originally posted by gtxragtop View Post
i was directed to check tachometer if there was signal while cranking and it was working fine.
I was to check CPS only if the tach wasn't working so i assume the CPS is working by sending signal to the tach?
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now that I think of it mine was throttle position sensor not cps. That happened on my pickup truck. The tps is hard to get to but is removable without taking a bunch of stuff off I believe. I have no idea if that would interrupt spark or not.00 SAN 210 (previous boat)
07 236 te soldComment
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how did you check the lanyard, did you joinn both wires together to eliminate the lanyard. did you replace it
I had the same problem and the engine turned over and it did not fire. it was as simple as the lanyard connection.
double and double check it and save yourself a lot of grief....Comment
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Check engine grounds: located on cylinder heads and block above knock sensor, follow them and tighten wires
Check fuel pressure: should be about 50-60 psig. Hook up a mechanical gauge to the schrader valve located on the fuel rail. What does it read when pump primes, how about when cranking?
Check injectors for signal: go to auto parts store and get a "noid light" this will plug into your injector hardness and tell you if the injector is getting the signal from the computer to fire. You may be able to check for voltage at the harness as well if noid light is not obtainable.
I believe you mentioned above that you did verify there was spark. Many sensors can cause the engine not to fire, cam position, crank position, even coolant temp sensor, map sensor as well.
Check the above and report back.Comment
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Also it could be that your injectors have gummed up. you can take them out and test them with a 9V battery to try and hear them clicking. You could soak them in kerosene for a couple hours to help remove any debris.Comment
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keep us posted.....Migs
G21 - En route
SAN 210 TE (Finally)
06 Sky Supreme V220(previous)
05 Sanger V210(previous)
01 MC X1(previous)
99 Air Warrior(previous)Comment
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found the culprit! no wonder there was no spark. **** made in china parts. had it replaced with a bosch.
thanks to PCM & everyone else in the forum for all the tips.Comment
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Good Deal
I'm glad you found it. Are there any GM mechanics there? This is basically a GM engine with some modifications it is close enough that any good GM tech should be able to repair it if you have problems or need maintenance .
Another PCM success story this is why I buy them .Comment
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Is that a relay?Comment
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Just had the SAME issueS, went through all the same trouble shooting. Did NOT pay attention that we went from a fuel pressure issue to a ignition issue after switching over the relays....Just noticed the boat wasnt starting still. Which makes now i get, both relays are needed. THREE days later we changed them over one last time and BOOM. It fired off with power going to the coil, just no fuel pressure.This was understood cause it sputtered a little from prior fuel in the line. SO then sprayed starter fluid in air intake and it fired , which was a GREAT sign! Went on a search and destroy mission around town looking for the relays. FOUND them installed them and shes all good. RIGHT IN TIME FOR THE FOURTH OF JULY WEEKEND!!Comment
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